[GIS] How to zoom to an ILayer

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I used IFeatureLayerDefinition.CreateSelectionLayer() to create a new IFeatureLayer then i cast this one to ILayer and set it to the Map, my problem is that i can't zoom programmatically to this ILayer, i tried to call ICommand.ControlsMapFullExtentCommandClass but it didn't work.

This is my code :

public static void myFunction(ITable table_commune, string code_commune)
{

        if(table_commune == null || code_commune == null) return;

        ILayer layer = (ILayer)table_commune;
        IFeatureLayer featureLayer = (IFeatureLayer)layer;

        IFeatureLayerDefinition featureLayerDef = (IFeatureLayerDefinition)featureLayer;

        IFeatureLayer new_featureLayer = featureLayerDef.CreateSelectionLayer("Commune", false, null, "NUM_COMMUNE = " + (code_commune));
        ILayer new_layer = (ILayer)new_featureLayer;

        Map.AddLayer(new_layer);
        Map.ActiveView.Refresh();

        ICommand command = new ControlsMapFullExtentCommandClass();
        command.OnCreate(Map.Object);
        if(command.Enabled) command.OnClick();
}

Best Answer

You could first select the layer in the table of contents refrencing this snippet:

HowTo: Select a layer in the Table of Contents of ArcMap using ArcObjects

Then, zoom to the active layer (ILayer) referencing this snippet:

Zoom to Active Layer in TOC Snippet

Related Solutions

[GIS] Get IFeatureLayer from ILayer using ArcGIS Engine

based on the conversation here is the code:

IMap mapControl = form.axMapControl2.ActiveView.FocusMap;
ICompositeLayer basemapCompositeLayer = (ICompositeLayer) mapControl.Layer[0];
ILayer basemapSubLayer = basemapCompositeLayer.Layer[0];
if (basemapSubLayer.Valid)
{
    if (basemapSubLayer is IFeatureLayer)
    {
        IFeatureLayer featureLayer1 = (IFeatureLayer) basemapSubLayer;
        // do your selection here
    }
    else if (basemapSubLayer is ICompositeLayer)
    {
        ILayer nextDown = (basemapSubLayer as ICompositeLayer).Layer[0];
        if (nextDown is IFeatureLayer)
        {
            IFeatureLayer featureLayer1 = (IFeatureLayer)nextDown;
            // do your selection here
        }
    }
}

[GIS] How to zoom to a specific point

You need to be more precise about what "zoom to" means in this case.

It is likely that you are actually thinking about a map update that combines both a zoom and a pan (shifting the map display to a different center position). You probably didn't mention the panning because you assumed that the point geometry should become the center of the "zoomed" map.

There's still the question of how close you want to zoom to the point:

Do you want to zoom to a fixed scale, e.g. 1:500?
Or do you want to have a fixed-distance border area visible around the point, for example 100 metres to each side?

Once you've decided this, you can construct an rectangular extent to which you will be zooming (something like map.ZoomTo(envelope), where Envelope is the computed extent).

Example for case 2 above:

double x = …; // X coordinate of your point geometry
double y = …; // Y coordinate of your point geometry
double borderAreaDistance = 100.0 /* map units */;
Envelope envelope = new Envelope { XMin = x - borderAreaDistance,
                                   YMin = y - borderAreaDistance,
                                   XMax = x + borderAreaDistance,
                                   YMax = y + borderAreaDistance };
map.ZoomTo(envelope);

(Case 1 above is a little more difficult, since translating from a map scale to an envelope involves knowledge of how large the map appears on the computer screen, and how large an area is represented in the map. Knowing the former means that you need to know the DPI value(s) of your user's monitor, and the size of the map control that displays the map.)

Best Answer

Related Solutions

[GIS] Get IFeatureLayer from ILayer using ArcGIS Engine

[GIS] How to zoom to a specific point

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